Media consumption and population characteristics of political opinion leaders - Andersen, Peter A. and Garrison, John P. (Communication Quarterly, 1978)
https://katalog.adlr.link/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTA4MC8wMTQ2MzM3NzgwOTM2OTMwMg